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Vaccines prevent between 2.5 and 4 million deaths every year.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

The pineal gland is a part of the thalamus region of the brain. It secretes melatonin. The pineal gland is a part of the thalamus region of the brain. It secretes melatonin.
The Spinal Cord, The Spinal Cord and Spinal Nerves; Close-up of the Caudal Region of the Spinal Nerv The Spinal Cord, The Spinal Cord and Spinal Nerves; Close-up of the Caudal Region of the Spinal Nerv
An H II Region An H II Region
The lacO region O1 containing an inverted repeat sequence The lacO region O1 containing an inverted repeat sequence
The trpL attenuator region mRNA transcript The trpL attenuator region mRNA transcript
Video: Interpreting a cladogram Animation

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